Winter Gem or Green Tower Boxwood for Hedge? - Knowledgebase Question

I would like to plant a hedge of boxwood in back of a retainer brick wall. The width for the hedge ranges from 1 foot to 4 feet; height anywhere from 4 feet plus is fine. I live in Tacoma WA and the hedge would get direct sunlight all day. Which boxwood would be best for this type of hedge and when is the best time to plant since it is already June.

Winter Gem is the hardiest of the boxwoods and reliably retains its dark green velvety foliage color all winter long. It grows 4-6' tall and wide but can be prune to maintain a smaller size. Green Tower grows at a moderate to fast rate and is columnar; nine feet tall, one to two feet wide. The foliage is dense and its lustrous dark green leaves have a lighter underside. Green Tower can be a carefree evergreen hedge barrier, and it looks great as a single columnar specimen or in pairs to flank a gate or entry. It adapts well to shearing, and makes a good choice for topiary forms. You can plant practically anytime in the Pacific Northwest. If rainfall isn't abundant you can always supplement with a hose. Provide about one-inch of water per week to your plants and they should become established quickly. Enjoy!